一种新型冲击磁铁的理论分析和模拟计算

Theoretical Analysis and Computer Simulation of a New Slotted Pipe Kicker Magnet

在国际上已有的冲击磁铁方案不能完全满足BEPCⅡ储存环注入系统对冲击磁铁宽均匀场区、高均匀度和低束流阻抗的设计要求的情况下 ,提出了一种新型冲击磁铁的设计思想 .理论分析和瞬态OPERA程序模拟计算的结果表明 ,在Δx =± 2 0mm的范围内 ,中心平面上场的均匀性为± 0 .6 % ,y =5mm的平面上场的均匀性为± 0 .7% ,y =10mm的平面上场的均匀性为± 2 .9% ,均优于BEPCⅡ储存环注入对冲击磁铁的设计要求 .MAFIA程序模拟计算的束流阻抗Z/n(eff)小于0 0 2 2Ω ,小于设计要求的 0 .0 2 5Ω .

The physics design of BEPCⅡ storage ring requires that the kicker magnets must have properties of wide uniform field region with high field uniformity and low beam impedance. In order to satisfy these requirements, a new slotted pipe kicker magnet is proposed. The results from theoretical analysis and OPERA program simulation show that the kicker magnet satisfies all requirements of BEPCⅡ storage ring. In the range of Δ x =±20mm, the field uniformity is ±0.6% in the central plane, ±0.7% in the y =5mm plane and ±2.9% in the y =10mm plane. The simulated results of MAFIA program also show that the beam impedance of the kicker magnet is lower than 0.022Ω, and it is less than the required value of 0.025Ω.